poyser



No. 625,898.. Patented May 30, I899.

.1. POYSER. WARP STOP MOTION FOR LOOMS.

(Application filed Nov. 4, 1897.)

(No Model.)

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No. 625,898. Patented May 30, I899.

J. PUYSER.

WARP STOP MOTION FOR LOOMSL (Application filed Nov. 4, 1897.) (No Model.) v 3 Sheets-Sheet 2.

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m; 625,898, Patented May so, was.

J. POYSER.

' WARP STOP MOTION FOR LOUMS.

(Application filed Nov. 4, 1897.) (No Model.)

3 ShaetsSheet 3.

NlTED STATES PATENT OFFICE.

JOHN POYSER, OF WVIRKSWORTH, ENGLAND.

WARP STOP-MOTION FOR LOOM S.

SPECIFICATION forming part of Letters Patent No. 625,898, dated May 30, 1899. Application filed November 4,1897- Serial No. 657,406. (NomodeL) To all whom it may concern:

Be it known that I, JOHN POYSER, a subject of the Queen of Great Britain, residing at \Virksworth, Derby, England, have invented new and useful Improvements in Warp Stop-Motions for VVeaving-Looms, of which the following is a specification.

My invention relates to a stop-motion for weaving-looms designed to operate upon the breaking of a warp-thread; and it consists, essentially, in suspending from the warpthreads, at a point at which they lie horizontally and are free from vertical movement due to the opening and closing of the shed, droppers adapted to hang from the warps and to slide in a frame which is pivoted at one end and at the other end connected by a rod with the striking mechanism,the said frame (which is herein referred to as the dropper-frame having working in proximity to it anoscillating knocking-off lever or hammer arranged in such relation to the dropper-frame that when one of the droppers falls or slides down therein, owing to the breakage of the warp supporting it, the said oscillating lever rocks the dropper-frame and operates" the striking mechanism. The hooks upon the droppers are so arranged that as they are lifted above the warp-threads they automatically engage therewith.

. To enable my invention to be fully understood, I will describe the same by reference to the accompanying drawings, in Which Figure 1 is a side elevation of so much of a loom as is necessary to illustrate the application of my warp stop-motion thereto, and Fig. 1 is a view of some of the parts shown in Fig. 1 in a different position. Fig. 2 is a sectional elevation looking in the direction of the arrow, Fig. 1. Figs. 3 and 4 are respectively a face view and an edge view of one of the droppers, drawn to a larger scale than Figs. 1 and 2; and Figs. 5 and 6 are respectively an end elevation and a sectional side view of the dropper-frame. Figs. 7 and 8 are views similar to Figs. 1 and 2, respectively, illustrating a modification; and Fig. 9 is a view showing a modified form of hook for the droppers.

Similar letters of reference indicate corresponding parts in the several figures.

a is the frame of the mechanism, which may be an independent frame, as shown in. the drawings, or part of the general framework of the loom, and b b are two bars or rollers carried in the said frame and across which pass the warp-threads in their passage from the letoff rollers c c to the vibrating roller or back bearer d, which oscillates under the operation of the shedding motion of the loom in awellknown manner.

Adjacent to the bars I) b, which serve for insurin g that the portions of the warps between the said bars shall always remain in a horizontal position, I fix two combs e e, which serve for insuring that the warp-threads shall always maintain a uniform distance apart.

f f are the droppers, one of which is suspended from each warp at a point between the two bars I) I), each of the saiddroppers, as shown in Figs. 3 and 4, being in the form of a fiat plate having a hook f at its upper end.

9 is the dropper-frame, (shown detached in Figs. 5 and 6,) which is pivoted to the main frame at g and at its free end connected by a rod g or by any other suitable means to the striking mechanism of the loom, (which may be of the kind described in the specification of my former patent, No. 568,275.) This drop per-frame, which normally hangs vertically, as shown, has arranged in it a number of guide-bars h h, between which the drop'pers are free to slide when the warp-threads suspending them break.

h' is a fixed guide for the upper part of the droppers.

'5 is the knocking-off ham mer, designed to be continuously and rapidly vibrated from any suitable part of the loom. This oscillating knocking-off hammer is arranged in such re lation to the dropper-frame that in its oscillation its free end moves to and fro beneath the droppers without coming in contact with them. In case, however, any one of the drop pers falls in the dropper-frame, owing to the breaking of the Warp-thread supporting it, the said dropper will fall into the path of 0s cillation of the knocking-off hammer, which will then impinge against the edge of the said dropper, and so oscillate the dropper-frame to stop the loom.

As shown in Figs. 1 and 2, the knocking-off hammer is pivoted upon centers j j in'a frame 70, which is fixed in position immediately below the frame a. The frame 7.: also carries a shaft 1, one end of which has fixed to it a pulley Z, through the medium of which and a belt motion may be communicated to the shaft Z, while the other end of the said shaft has upon it a crank-pin Z which projects into a slot at in an extension-arm m of the knocking-off hammer. With this arrangement it will be understood that as the pulley rotates the knocking-oft" hammer will be caused to oscillate.

In the arrangement of my invention shown in Figs. 7 and 8 the knocking-off hammer is pivoted to the frame a upon the pivots which carry the dropper-frame, the said knockingoff hammer extending downward to a point below the level of the droppers and being provided with an arm '11, having upon it a cam or projection 'n, which is kept in contact with a pin n upon an arm n by a spring n. This arm n is in this modification a prolongation of the let-off lover of the kind described in the specification of my former application for a patent, Serial No. 613,148. As this let-off lever oscillates in the manner referred to in the said former specification, the pin 71. by acting upon the projection n will cause the knocking-off hammer to oscillate in the desired manner.

The extent to which the droppers descend in the dropper-frame is limited by a bar 0, *extendingthrough recesses 0 in the said droppers and carried by levers 0 0 pivoted to the frame a. This bar 0 is prolonged at one side of the loom to form a handle, whereby when any dropper has fallen it may be raised by lifting the said bar to the extent allowed by the said recesses o.

In order to allow of the droppers being packed as closely as possible side by side, and also to allow any dropper to fall freely without its barb orhook fouling the adjacent droppers, I attach the barbs to the droppers at one side instead of in the center, and on the other side at a corresponding distance from the center I provide a slot 19, as clearly shown in Fig. 3. I attach the barb to one side of half the number of droppers and at the other side to the remaining half, and I arrange the droppers alternately, so that each barb has on each side of it the slot 19 in the adjacent dropper.

In Figs. 3 and 4 the hooks f are represented as in the form of a half arrow-head, the position of the barb relatively with the warp-thread with which it is to be engaged being such that as the dropper is raised by the bar 0 the said barb will force the warpthread laterally, whereby when the barb has passed above the warp the latter will assume a position beneath the said barb, and so support the dropper. Instead of using this form of hook, however, I may use the form shown in Fig. 9. In this modification the upper end of each hook is formed with a V-shaped notch, the bottom or point of which is connected by a slit with the eye through which the warp thread normally runs.

The operation of the apparatus hereinbefore described is as follows: Upon the breaking of a warp-thread the dropper suspended therefrom falls by its own weight (or, if necessary, under the action of a spring) until it is arrested by the upper edge of the recess 0' coming into contact with the bar o-that is to say, until the dropper occupies the position indicated in Fig. 1. This downward movement of the dropper brings the lower end of the same into the path of the oscillating hammer i, so that during the next forward movement of the hammer the latter causes the dropper-frame to swing also, as shown in Fig. 1 and operate the knocking-off mechanism. After the broken warp has been repaired the handle extension of the bar 0 is raised by the operative until the hook is lifted above the warp, when the handle is again lowered, leaving the dropper suspended from the warp, as before.

It will be seen that by the use of the arrangement shown for operating the knocking-off hammer the knocking off maybe arranged to take place at any desired point in the cycle of weaving operations or at one of any number of points in such cycle, according to the speed at which the pulley Z or the lever-arm n is operated.

The arrangement hereinbefore described is particularly adapted for narrow-ware looms of the kind described in the specifications of former patents, Nos. 547,130 and 568,275; but it is to be understood that my invention can also be applied to looms for weaving wide fabrics.

Having now particularly described and ascertained the nature of my said invention and in what manner the same is to be performed, I declare that what I claim is- 1. In combination in a warp stop-motion for looms, the main frame, the droppers, the dropper-frame comprising the side bars pivoted to the main frame, and a web below said pivotal points connecting said side bars, said web having guiding-openings therein for said droppers, one of said side bars having an extension connected to the striking mechanism of the loom, and the knock-off hammer, substantially as described.

2. In combination, the loom -frame, the droppers for engaging the warp-threads, said droppers comprising a fiat body portion having a recessed front edge and a hook portion extending from the body portion, arms pivoted to the side of the loom-frame a cross-rod extending between said arms through the recesses in said droppers and a handle carried by one of said arms for lifting said cross-rod to raise said droppers, substantially as described.

JOHN POYSER.

Witnesses:

WILLIAM MORS, HARRY WARSOP. 

